Improvement in harvesters



2*Sheets--lSheet 2. LJ. MCCORM l CK 8L WQ R. BAKER.

Improvement in Hari/esters.-

Patented Oct. 17

UNITED STATES i PATENT Orrren.

LEANDER J. MCOORMICK AND WILLIAM R. BAKER, OF CHICAGO, ILLINOIS, ASSIGNORS TO O. H. MCOORMIOK St BRO., OF SAME PLACE.

IMPROVEMENT IN HARVESTERS.

Specication forming part of Letters Patent No. 119,937, dated October 17, 1871.

To all whom it may concern:

Be it known that we, LEANDER J. MCCOR- MIcK and WILLIAM R. BAKER, both of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Harvesters, of which the following is a speciiication:

The object of our invention is to enable the driver while reaping to raise and lower the points ofthe guards of the well known Ad vance77 harvester built by O. H. McCormick & Bro., of Chicago, Illinois, without stopping the reel or rake; to which end our improvement con sists in combining with said machine an extensible brace to rock the nger-beam by means of the rake-post.

In the accompanying drawing, Figure 1 represents a side elevation of so much of an advance machine with our improvement applied thereto as is necessary to illustrate our invention; Fig. 2, a rear elevation of the machine without the rake-post; Fig. 3, a front elevation of the extensible brace; and Fig. 4, a face view of the device for lengthening or shortening the brace.

The construction of the Advance machine is well known and is described in the patent granted to O. H. McCormick St Bro., December 28, 1869, No. 98,394; therefore, those parts only of the machine necessary to understand the invention herein claimed will be referred to herein.

The rake-postA is mounted on the shoe in the usual way. The brace B is made in sections b b', pivoted, respectively, to the rake-post and frame, and sliding one over the other. The upper section b of the brace is provided with a loop, c, through which the lower section b slides, and with a rack, d, which works over a pinion, c, on the lower section. This pinion is turned by a crank, E, provided with aspring detent, e', which locks into a ratchet, D, on the lower seetion of the brace. A sprocket-pulley, F, on the main axle drives a corresponding Wheel, G, on

the reel and rake-shaft by means ot' a chain, H. A tension pulley, I, is mounted 011 a radiusbar, J, pivoted at j to the rake-post, and is controlled by a guide, K. A link-rod. L, is pivoted to the frame and to the radius-bar to maintain the tension pulley in proper relation to the chain.

The guide is fixed on the rake-post and the radius-bar is grooved to move over it.

In operation the driver rocks the guards by releasing the detent and turning the crank, thus lengthening or shortening the brace B. link-rod L holds the tension-pulley in the proper position to keep the driving-chain taut, and the tension-pulley may be adjusted by means of the slide Z on the end of the link-rod, which slide is adjustable by means of a slot and set-screw, m.

Our invention is an improvement on the device invented by WV. N. Johnson, of Marquette, Visconsin, for rocking the guards of the Advance machine, which device differs from ours, as Johnsons brace has to be uncoupled from the rakepost to rock the guards, while our brace is not so removed, being made extensible and having the rocking mechanism applied directly to it, which we consider a decided improvement.

We claim as our invention- The combination of the rockin g shoe, the rake-post, the extensible sectional brace connecting the rake-post and frame, and the rack, pinion, and detent for adjusting and holding the brace, these members being constructed and operating in combination, substantially as herein before set forth, to enable the driver to rock the guard-fingers without leaving his seat and while the machine is working.

In testimony whereof We have hereunto subscribed our names.

L. J. MOCORMICK. WM. R. BAKER.

The 

